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`100mL` of buffer of `1 M NH_(3)(aq)` and `1 M NH_(4)^(o+)(aq)` are placed in two compartments of a voltaic cell separately. A current of `1.5A` is passed through both cells for `20 m i n`. If only electrolysis of water takes place, thenA. `L.H.S.` will increaseB. `R.H.S.` will increaseC. Both side will increaseD. Both side will decrease |
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Answer» Correct Answer - B In `R.H.S.` formation of `OH^(-)` takes palce which reacts with buffer as `NH_(4)^(+) + OH^(-) rarr NH_(3) + H_(2)O` Thus `[NH_(4)^(+)]` decrease and `[NH_(3)]` increasee. Also `pOH = pK_(b) + "log"([NH_(4)^(+)])/([NH_(3)])` Thus, `pOH` decreases or `pH` increases. Similarly in `L.H.S.` formation of `H^(+)` shows. `NH_(3) rarr H^(+) rarr NH_(4)^(+)` or `[NH_(4)^(+)]` Increases and `[NH_(3)]` decreases. Thus `pOH` increases or `pH` decreases. |
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